1096. A muggleborn at Hogwarts thinks it’s ridiculous that they wear robes while playing Quidditch and finally it is agreed that players can wear what they want as long as it's in their house colors. This rule had to be slightly altered after May 2014. During the last Ravenclaw vs. Slytherin game of that year, some seventh year Ravenclaw players turned up naked painted in blue and bronze. It was the most house points lost in centuries according to the ghosts.